package com.hmall.gateway.filters;

import com.hmall.gateway.config.AuthProperties;
import com.hmall.gateway.utils.JwtTool;
import lombok.RequiredArgsConstructor;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.util.AntPathMatcher;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

import java.util.List;

@Component
@RequiredArgsConstructor
public class AuthGlobalFilter implements GlobalFilter , Ordered {
    private final AuthProperties authProperties;
    private final JwtTool jwtTool;
    private final AntPathMatcher antPathMatcher = new AntPathMatcher();

    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        //1.获取re quest
        ServerHttpRequest request = exchange.getRequest();
        //2.判断是否需要做登录拦截
        if(isExclude(request.getPath().toString())){
            return chain.filter(exchange);
        }

        //3.获取token
        String token=null;
        Long userId = null;
        List< String> headers = request.getHeaders().get("authorization");
        if(headers != null &&!headers.isEmpty()){
            token = headers.get(0);
        }
        //4.校验token
        try {
             userId = jwtTool.parseToken(token);
        } catch (Exception e) {
           //拦截 设置响应码
            ServerHttpResponse response = exchange.getResponse();
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }

        //  5.保存并传递 token
        String userInfo=userId.toString();
        ServerWebExchange ex = exchange.mutate()
                .request(builder -> builder.header("user-info", userInfo))
                .build();

        //6.放行
        return chain.filter(ex);
    }

    private boolean isExclude(String path) {
        for (String pathPattern : authProperties.getExcludePaths()) {
             if(antPathMatcher.match(pathPattern,path)){
                 return true;
             }

        }
        return  false;
    }

    @Override
    public int getOrder() {
        return 0;
    }
}
